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you dont need any diagram, you need to know how it works. Start from vacuum pump , on all valves you have vacuum in on the top , in the middle is vacuum out (stgering) ad the bottom lines is going to air filter. Thats all you need to know

See if there is a manufactures web site and inquire if diagram is available or just Google for info with proper make and model.Fist just search for vacuum diagrams then refine search for your vacuum but this not always easy can be confusing so might have to take it to vacuum repair business or if you have not dissembled it yet just make notes when you do. Its not as hard as it seems I have done it many times.

Copy and paste this web address into your browser: http://www.vacpartswarehouse.com/Eureka-2900-Contour-Upright-Vacuum-s/1839.htm

When it opens you will see a diagram of your vacuum. Scroll down to the 2nd diagram, which is of the lower section. You can pick out the parts you need and order them on this site. The diagram should help you see where all the parts go.

Shy503p, You will find the vacuum diagrams you desire in a Chilton's model specific manual for your 87 Mustang (just make sure the one you buy does in fact include the vacuum diagrams). You may also find it in a general domestic Chilton's that covers your year (I have one for up to 88 domestics) and I will check it for your diagram when I get the chance to dig it out.Let us know how you fair, and Good Luck.